. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 204 TERRESTRIAL AIR-BREATHING MOLLUSKS. Head, neck, and eye-peduncles black, posterior and lower parts lighter; eye- peduncles long and slender, tentacles very short. Jaw wide, low, slightly arcuate, ends blunt, but little attenuated. Lingual membrane (PL IV. Fig. T) as usual in the genus. Teeth about 15—1—-15, with about 7 perfect laterals. Centrals quite narrow, the reflected portion very small, tricuspid. Laterals quite broad, bicuspid. Marginals quad- rate, low, wide, with one inner, long, oblique, blunt denticle,
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 204 TERRESTRIAL AIR-BREATHING MOLLUSKS. Head, neck, and eye-peduncles black, posterior and lower parts lighter; eye- peduncles long and slender, tentacles very short. Jaw wide, low, slightly arcuate, ends blunt, but little attenuated. Lingual membrane (PL IV. Fig. T) as usual in the genus. Teeth about 15—1—-15, with about 7 perfect laterals. Centrals quite narrow, the reflected portion very small, tricuspid. Laterals quite broad, bicuspid. Marginals quad- rate, low, wide, with one inner, long, oblique, blunt denticle, and several outer, small, irregular, blunt denticles. The outer lower edges of the centrals and laterals have the projecting or short reinforcements shown in the figures referred to above. Though we retain the species in the genus Pupa, it must be remembered that as treated by Pfeiffer it would be placed in Buliminns of Albers and Martens. In general form of shell it certainly approaches Buliminus montanus, Drap. Pupa modica, Gould. Vol. III. PI. LI I. Fig. 2. Shell small, delicate, elongated, ovate-conic, whitish or pale horn-colored, im- perforate; whorls 5, convex, the apex of the spire acute; aperture expanded, peristome revolute, but not flattened, its right margin strongly curved above ; throat destitute of teeth. Length, 2h mill.; diameter, If mill. Pupa modica, Gould, Proc. Bost. Soe. Nat. Hist., 111. 40 (1848) ; Terr. Moll., II. 318, PL LII. Fig. 2. —W. ('.. , Terr. Moll., IV. 142 ; L. & Sh., I. 240 (1869). — Pfeiffer, Mon. ILL Viv., III. 533. Bulimus modicus, Pfeiffer, Mon. Hel. Viv., IV. 414. Pupilht modica, Tiiyon, Ainer. Journ. Conch., III. 306(1868). Southern Region, in Georgia, Florida, and Alabama. The form and other characters of this shell are almost precisely those of Pupa fallax, except that it is only about half as large, and has about two whorls less to the spire. The aperture is somewhat more bell-shaped; and the peri- stome is
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